This is a female of the Winter Moth (Operophtera brumata) which found a suitable place on my window. This species is active at night throughout the winter from October to December. The female is wingless and the male is fully winged and flies strongly to find the female. After mating, the females lay their eggs in tree bark crevices or in other sheltered locations and all adults die.....a new generation will be hatch in spring and a new circle of life will start again.